Localized Solder Joint Heating for PCB-Safe Desoldering

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Solution Overview

Problem

Existing methods for desoldering electronic components from printed circuit boards often cause unintended heating of the board, potentially introducing moisture issues and complicating fault diagnosis, especially for complex components like microcontrollers with high pin density.

Innovation Solution

A heating device with specific electrical-connection and heating means is used to target and melt solder joints without heating the board, featuring a shape that fits under the component and reaches the solder's melting point, allowing controlled desoldering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a bell is used to locally heat the electronic component and printed circuit board to melt solder joints, then desoldering capability is improved, but unintended heating of the board occurs causing moisture ingress and complicating fault diagnosis

Engineering Contradiction:

Improvedesoldering capabilityVSAvoidunintended board heating and moisture ingress

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The heating device applies heat locally only to the solder joint area through a heating element positioned between the component and board, rather than heating the entire board. This localized heating approach melts the solder joints while keeping the board temperature below moisture ingress thresholds, resolving the contradiction between effective desoldering and preventing board damage

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

A heating element is introduced as an intermediary device positioned between the electronic component and printed circuit board. This intermediary transfers heat directly to the solder joints through conduction while isolating the board from excessive heat exposure, enabling precise thermal control that achieves desoldering without causing moisture-related damage

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If the entire printed circuit board is placed in an oven for heating, then uniform heating is achieved, but moisture ingress into the board and components occurs

Engineering Contradiction:

Improveuniform heatingVSAvoidmoisture ingress

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

Instead of uniform heating of the entire board, the invention applies heat locally only to the specific solder joint area using a positioned heating element. This localized approach achieves the necessary temperature for desoldering while keeping the rest of the board below moisture ingress temperatures, eliminating the harmful effect while maintaining heating effectiveness

Inventive Principle:

Principle #3Local quality

3Productivity

If high power heating is applied to melt solder joints quickly, then desoldering speed is improved, but risk of damaging the printed circuit board increases

Engineering Contradiction:

Improvedesoldering speedVSAvoidprinted circuit board damage risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The heating device concentrates high power heating locally at the solder joint interface rather than distributing it across the entire board. This localized high-power approach enables rapid desoldering while the restricted heating zone prevents thermal damage to the printed circuit board, resolving the contradiction between speed and safety

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The heating element acts as an intermediary that delivers high power heating precisely where needed at the solder joints while isolating the broader board area from excessive heat. This mediated heating approach enables fast desoldering operations without compromising board integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively desolders components without overheating the board, improving fault detection reliability and minimizing moisture ingress, thus facilitating accurate fault analysis.

Implementation Method 1

heating means suitable for reaching a temperature at least equal to the melting point of the material of which the solder is made

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

heating means suitable for reaching a temperature at least equal to the melting point of the material of which the solder is made

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

heating means suitable for reaching a temperature at least equal to the melting point of the material of which the solder is made

Methodology Applied

Scientific EffectMelting: Melting

Data Source

PatentUS12502722B2Method for heating a soldered joint

Publication Date: 2025.12.23 SCHAEFFLER TECHNOLOGIES AG & CO KG

AI summary

A method for a heating device suitable for heating at least one soldered joint between an electronic component including at least a first contact mound and a printed circuit board. The soldered joint on the one hand securing the electronic component to the printed circuit board and on the other hand, while providing electrical continuity, the electronic component also having an electronic-component width, and an electronic-component thickness, wherein it includes an electrical-connection suitable for being coupled to an electrical power supply and a heater suitable for reaching a temperature at least equal to the melting point of the solder.